74LCX02MX NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74LCX02MX is a 4-channel 2-input NOR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part operates across a 2V to 3.6V supply voltage range with low quiescent current consumption of 10 µA maximum. The 74LCX02MX is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Max)	10 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.7V ~ 0.8V
Input Logic Level - High	1.7V ~ 2V
Max Propagation Delay @ 3.3V, 50pF	5.2ns
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LCX02MX is determined by strict equivalence across the following critical parameters:

Logic function: 4-channel 2-input NOR gate
Supply voltage range compatibility: minimum 2V operation
Output drive capability: 24mA high and low
Input logic thresholds: 0.7V–0.8V low, 1.7V–2V high
Package form factor: 14-SOIC surface mount
Propagation delay performance: ≤5.5ns @ 3.3V, 50pF load
Environmental compliance: ROHS3, MSL 1

Substitute parts are grouped into two categories based on supply voltage range and quiescent current specifications:

Category A (2V–3.6V Supply, 10 µA Quiescent): Direct functional equivalents with identical supply voltage floor and quiescent current ratings. These parts maintain the exact electrical operating envelope of the 74LCX02MX.

Category B (1.65V–3.6V or 1.2V–3.6V Supply, ≤1 µA Quiescent): Enhanced performance substitutes with lower minimum supply voltage and reduced quiescent current. These parts are backward compatible with 74LCX02MX applications and offer improved power efficiency.

Parameter Comparison

Part Number	Manufacturer	Product Status	Supply Voltage	Quiescent Current (Max)	Propagation Delay @ 3.3V, 50pF	Operating Temperature	Package	Packaging Type
74LCX02MX	onsemi	Obsolete	2V ~ 3.6V	10 µA	5.2ns	-40°C ~ 85°C	14-SOIC	Tube
MC74LCX02DR2G	onsemi	Active	2V ~ 3.6V	10 µA	5.5ns	-40°C ~ 85°C	14-SOIC	Tape & Reel
MC74LCX02DG	onsemi	Obsolete	2V ~ 3.6V	10 µA	5.5ns	-40°C ~ 85°C	14-SOIC	Tube
74LVC02AD,118	NXP Semiconductors	Active	Not specified	Not specified	Not specified	Not specified	Not specified	Bulk
74LVC02AD-Q100J	Nexperia USA Inc.	Active	1.2V ~ 3.6V	10 µA	4.4ns	-40°C ~ 125°C	14-SO	Tape & Reel
SN74LVC02AD	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.2ns	-40°C ~ 125°C	14-SOIC	Tube
SN74LVC02ADR	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.2ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC02ADT	Texas Instruments	Discontinued at DiGi Electronics	1.65V ~ 3.6V	1 µA	4.2ns	-40°C ~ 125°C	14-SOIC	Tube
SN74LVC02ANS	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.2ns	-40°C ~ 125°C	14-SOIC	Tube
SN74LVC02ANSR	Texas Instruments	Active	1.65V ~ 3.6V	1 µA	4.2ns	-40°C ~ 125°C	14-SOIC	Tape & Reel
SN74LVC02AQDRG4Q1	Texas Instruments	Active	2V ~ 3.6V	10 µA	5.5ns	-40°C ~ 125°C	14-SOIC	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Active Status, Identical Supply Voltage):

MC74LCX02DR2G and SN74LVC02AQDRG4Q1 are the preferred substitutes for the 74LCX02MX. Both maintain the 2V–3.6V supply voltage range and 10 µA quiescent current specification. MC74LCX02DR2G is available from onsemi in active production with tape and reel packaging. SN74LVC02AQDRG4Q1 is a Texas Instruments automotive-grade part (AEC-Q100 qualified) with extended operating temperature to 125°C, available in active production.

Secondary Substitutes (Active Status, Extended Supply Voltage):

SN74LVC02ADR, SN74LVC02AD, and SN74LVC02ANSR are Texas Instruments 74LVC series parts with extended supply voltage range (1.65V–3.6V) and reduced quiescent current (1 µA). These parts are fully backward compatible with 74LCX02MX applications and offer superior power efficiency. All three are in active production with ROHS3 compliance and MSL 1 rating.

Automotive-Grade Alternative:

74LVC02AD-Q100J from Nexperia USA Inc. is an automotive-qualified part (AEC-Q100) with extended temperature range (-40°C to 125°C) and lowest propagation delay (4.4ns). This part operates across 1.2V–3.6V supply voltage and is suitable for automotive and industrial applications requiring enhanced reliability.

Avoid:

SN74LVC02ADT is discontinued at DiGi Electronics and should not be selected for new designs. MC74LCX02DG is obsolete and should be replaced with MC74LCX02DR2G.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC02ADR as a direct replacement for 74LCX02MX?

A: Yes. SN74LVC02ADR is functionally equivalent. It provides the same 4-channel 2-input NOR gate logic, identical output drive capability (24mA), and compatible input logic thresholds. The extended supply voltage range (1.65V–3.6V) and lower quiescent current (1 µA) make it a superior choice for power-sensitive applications. Operating temperature extends to 125°C versus 85°C on the original part.

Q: What is the difference between 14-SOIC and 14-SO packaging?

A: Both are 14-pin surface mount packages with identical pin pitch and electrical compatibility. The primary difference is physical width: 14-SOIC is 0.154" (3.90mm) wide, while 14-SO is 0.209" (5.30mm) wide. Parts in 14-SO packaging (SN74LVC02ANS, SN74LVC02ANSR) are mechanically compatible with 14-SOIC footprints but occupy more board space. Verify PCB layout constraints before selecting 14-SO variants.

Q: Is the 74LVC02AD-Q100J suitable for automotive applications?

A: Yes. The 74LVC02AD-Q100J carries AEC-Q100 automotive qualification and is rated for -40°C to 125°C operating temperature. It meets automotive reliability and environmental stress screening requirements. Select this part for automotive, industrial, or mission-critical applications requiring enhanced qualification.

Q: Why do some substitutes have lower quiescent current?

A: The 74LVC series (Texas Instruments and Nexperia) uses advanced CMOS process technology that reduces standby power consumption to 1 µA compared to 10 µA in the 74LCX02MX. This improvement is transparent to circuit operation and provides direct power savings in battery-powered or low-power applications.

Q: Can I mix packaging types (Tube, Tape & Reel, Bulk) in production?

A: Packaging type affects procurement and handling but not electrical performance. Tube packaging is suitable for manual assembly or small-volume production. Tape & Reel packaging is required for automated pick-and-place assembly. Bulk packaging is used for high-volume direct component distribution. Select packaging based on assembly process requirements, not electrical compatibility.

Q: What is the propagation delay difference between 74LCX02MX and SN74LVC02ADR?

A: The 74LCX02MX specifies 5.2ns maximum propagation delay at 3.3V with 50pF load. SN74LVC02ADR specifies 4.2ns under identical conditions. The 1ns improvement in SN74LVC02ADR is due to advanced process technology and does not affect functional compatibility. Both meet standard logic timing requirements for general-purpose applications.

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